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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2012
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities, Based on Contractual Maturity Dates
The following tables summarize the amortized cost basis of debt securities included in marketable securities, the aggregate fair value of those securities, and gross unrealized gains and losses on those securities at September 30, 2012 and December 31, 2011. The Company classifies its debt securities, other than mortgage-backed securities, based on their contractual maturity dates. Maturities of mortgage-backed securities have been estimated based primarily on repayment characteristics and experience of the senior tranches that the Company holds. The debt securities listed at September 30, 2012, excluding mortgage-backed securities, mature at various dates through August 2015. The mortgage-backed securities listed at September 30, 2012 mature at various dates through April 2028.


 
 
Amortized
 
Unrealized
 
Fair
At September 30, 2012
 
Cost Basis
 
Gains
 
Losses
 
Value
Unrestricted
 
 
 
 
 
 
 
 
Maturities within one year:
 
 
 
 
 
 
 
 
U.S. government obligations
 
$
76,443

 
$
84

 
$
(1
)
 
$
76,526

U.S. government guaranteed corporate bonds
 
57,963

 
18

 
(1
)
 
57,980

Municipal bonds
 
9,052

 


 

 
9,052

 
 
143,458

 
102

 
(2
)
 
143,558

Maturities after one year through five years:
 
 
 
 
 
 
 
 
U.S. government obligations
 
291,751

 
695

 
(9
)
 
292,437

Municipal bonds
 
17,530

 
2

 
(7
)
 
17,525

 
 
309,281

 
697

 
(16
)
 
309,962

Maturities after five years through ten years:
 
 
 
 
 
 
 
 
Mortgage-backed securities
 
157

 

 
(66
)
 
91

 
 
452,896

 
799

 
(84
)
 
453,611

Restricted
 
 
 
 
 
 
 
 
Maturities within one year:
 
 
 
 
 
 
 
 
U.S. government obligations
 
4,248

 
4

 

 
4,252

 
 
 
 
 
 
 
 
 
Maturities after one year through five years:
 
 
 
 
 
 
 
 
U.S. government obligations
 
3,767

 
9

 

 
3,776

 
 
8,015

 
13

 

 
8,028

 
 
$
460,911

 
$
812

 
$
(84
)
 
$
461,639


 
 
Amortized
 
Unrealized
 
Fair
At December 31, 2011
 
Cost Basis
 
Gains
 
(Losses)
 
Value
Unrestricted
 
 
 
 
 
 
 
 
Maturities within one year:
 
 
 
 
 
 
 
 
U.S. government obligations
 
$
12,025

 
$
42

 

 
$
12,067

U.S. government guaranteed corporate bonds
 
15,263

 
53

 

 
15,316

U.S. government guaranteed collateralized mortgage obligations
 
623

 

 
$
(1
)
 
622

Municipal bonds
 
15,314

 
13

 
(1
)
 
15,326

 
 
43,225

 
108

 
(2
)
 
43,331

Maturities after one year through five years:
 
 
 
 
 
 
 
 
U.S. government obligations
 
272,433

 
400

 
(81
)
 
272,752

Mortgage-backed securities
 
104

 

 
(76
)
 
28

 
 
272,537

 
400

 
(157
)
 
272,780

Maturities after five years through ten years:
 
 
 
 
 
 
 
 
Mortgage-backed securities
 
164

 

 
(77
)
 
87

 
 
315,926

 
508

 
(236
)
 
316,198

Restricted
 
 
 
 
 
 
 
 
Maturities within one year:
 
 
 
 
 
 
 
 
U.S. government obligations
 
3,347

 
10

 

 
3,357

 
 
 
 
 
 
 
 
 
Maturities after one year through five years:
 
 
 
 
 
 
 
 
U.S. government obligations
 
2,572

 
11

 

 
2,583

 
 
5,919

 
21

 

 
5,940

 
 
$
321,845

 
$
529

 
$
(236
)
 
$
322,138
Fair Value and Unrealized Losses of Marketable Securities
The following table shows the fair value of the Company’s marketable securities that have unrealized losses and that are deemed to be only temporarily impaired, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at September 30, 2012 and December 31, 2011.

 
Less than 12 Months
 
12 Months or Greater
 
Total
At September 30, 2012
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
Unrestricted
 
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
$
27,033

 
$
(10
)
 

 

 
$
27,033

 
$
(10
)
U.S. government guaranteed corporate bonds
25,411

 
(1
)
 

 

 
25,411

 
(1
)
Municipal bonds
11,073

 
(7
)
 


 


 
11,073

 
(7
)
Equity security


 


 
$
2,543

 
$
(1,501
)
 
2,543

 
(1,501
)
Mortgage-backed securities

 

 
91

 
(66
)
 
91

 
(66
)
 
$
63,517

 
$
(18
)
 
$
2,634

 
$
(1,567
)
 
$
66,151

 
$
(1,585
)
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2011
 
 
 
 
 
 
 
 
 
 
 
Unrestricted
 
 
 
 
 
 
 
 
 
 
 
U.S. government obligations
$
103,529

 
$
(81
)
 

 

 
$
103,529

 
$
(81
)
U.S. government guaranteed collateralized mortgage obligations
623

 
(1
)
 

 

 
623

 
(1
)
Municipal bonds
4,603

 
(1
)
 

 

 
4,603

 
(1
)
Equity security
3,019

 
(1,025
)
 

 

 
3,019

 
(1,025
)
Mortgage-backed securities

 

 
$
116

 
$
(152
)
 
116

 
(152
)
 
$
111,774

 
$
(1,108
)
 
$
116

 
$
(152
)
 
$
111,890

 
$
(1,260
)